74ACT373SJX D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACT373SJX is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 channel configuration with tri-state output capability. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The part operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SOP surface mount package. Substitute parts must maintain functional equivalence across logic type, circuit configuration, output characteristics, and electrical performance parameters.

Substiute Parts

74ACT373SJX

onsemiIn Stock: 320074ACT373SJX Datasheet

Current PartRFQ

SN74ACT373NSR

Texas InstrumentsIn Stock: 2171SN74ACT373NSR Datasheet

DirectRFQ

CD74ACT373M96

Texas InstrumentsIn Stock: 3009CD74ACT373M96 Datasheet

SimilarRFQ

SN74ACT373DW

Texas InstrumentsIn Stock: 1749SN74ACT373DW Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT373SJX is determined by strict equivalence across the following parameters: base product number (74ACT373), logic type (D-Type Transparent Latch), circuit configuration (8:8), output type (tri-state), supply voltage range (4.5V ~ 5.5V), output current capability (24mA), and independent circuit count (1). All substitute parts must maintain these core electrical and functional characteristics. Package variations are permitted provided the physical footprint remains compatible with the application's PCB layout requirements. Propagation delay and operating temperature range may vary within acceptable limits for the specific application context.

Parameter Comparison

Engineering Selection Recommendations

SN74ACT373NSR is the primary direct substitute for 74ACT373SJX. Both parts share identical package dimensions (20-SOIC 0.209" width), matching operating temperature range (-40°C ~ 85°C), and equivalent propagation delay (8.5ns versus 8ns). SN74ACT373NSR maintains active product status with ROHS3 compliance and is available in Tape & Reel packaging for production environments.

CD74ACT373M96 provides an alternative with extended operating temperature range (-55°C ~ 125°C) and superior propagation delay performance (3ns). This part utilizes a wider 20-SOIC package (0.295" width), requiring PCB layout verification for footprint compatibility. CD74ACT373M96 is suitable for applications requiring enhanced thermal performance or tighter timing specifications.

SN74ACT373DW is discontinued at DiGi Electronics and should not be selected for new designs despite active status at other distributors. This part shares the wider 20-SOIC package footprint (0.295" width) with CD74ACT373M96 and equivalent propagation delay characteristics (8.5ns).

For new production designs, SN74ACT373NSR is the recommended primary selection based on active status, package compatibility with the original 74ACT373SJX, and established supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT373NSR directly replace 74ACT373SJX without PCB modifications?

A: Yes. Both parts use identical 20-SOIC package dimensions (0.209" width, 5.30mm), pin configuration, and electrical specifications. No PCB layout changes are required.

Q: What is the difference between the 0.209" and 0.295" package widths?

A: These represent different SOIC package body widths. The 0.209" width (narrow body) is used by SN74ACT373NSR and matches the original 74ACT373SJX footprint. The 0.295" width (wide body) is used by CD74ACT373M96 and SN74ACT373DW. PCB pad spacing and land patterns differ between these packages and are not interchangeable without layout redesign.

Q: Why does CD74ACT373M96 have faster propagation delay (3ns) compared to other substitutes?

A: Propagation delay is a specified electrical characteristic that varies by manufacturer process and design. CD74ACT373M96 is specified with 3ns delay, while SN74ACT373NSR and SN74ACT373DW are specified with 8.5ns. Both values meet the functional requirements of the 74ACT373 logic family. Application timing analysis determines whether the faster specification is necessary.

Q: Is the 74ACT373SJX truly obsolete, or can it still be sourced?

A: The 74ACT373SJX is classified as obsolete by onsemi. While inventory may exist in distribution channels, new production should transition to active alternatives such as SN74ACT373NSR to ensure long-term supply chain stability and manufacturer support.

Q: What does ROHS3 compliance mean for these substitute parts?

A: ROHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive 3, restricting the use of specified hazardous materials in electrical and electronic equipment. All Texas Instruments substitutes listed are ROHS3 compliant. The original 74ACT373SJX does not specify RoHS status.

Q: Are all substitute parts available in the same packaging formats?

A: No. SN74ACT373NSR is supplied in Tape & Reel (TR) format for automated assembly. SN74ACT373DW is supplied in Tube format. CD74ACT373M96 is supplied in Tape & Reel format. Packaging selection depends on production volume and assembly equipment requirements.